Calm, considered guidance for first-time buyers — built around how lenders actually assess affordability.
Buying a first home is rarely just a financial decision. The property will shape the next several years of your life, in an area you have been thinking about, often at a price that feels significant.
Most public information about first-time buyer mortgages assumes an idealised borrower — clean credit, salaried income, a 5% deposit, a straightforward property. In practice, few first-time buyers fit that template. Deposits are often part-saved, part-gifted. Incomes include bonuses or recent self-employment. Properties involve leasehold considerations. And competitive markets force decisions before all the variables are fully understood.
What helps is preparation rather than pressure. A clear view of what you can borrow, against what kind of property, on what terms — before you start making offers.
Why first-time buyer applications are different
Lenders treat first-time buyers more carefully than experienced buyers — not because they distrust them, but because there is less evidence to work with.
A second-time buyer has a track record. They have run a mortgage account, made payments through interest-rate movements, demonstrated their behaviour as a borrower over years. A first-time buyer has none of that history with the lender. So the assessment relies more heavily on what can be evidenced now: income consistency, savings discipline, credit conduct, the deposit and where it came from.
This is not an obstacle. It is the system working as intended. But it does mean that small things matter more on a first purchase than they will on subsequent ones — credit file accuracy, the structure of a gifted deposit, the way an annual bonus is documented. Getting those details right at the application stage often makes the difference between a smooth case and a difficult one.
What lenders look at
The same broad framework applies whether you are a single applicant, a couple buying together, or supported by family. The weighting between the factors varies between lenders, sometimes significantly.
Income and affordability.
Most lenders work on a multiple of your gross annual income — typically four to four-and-a-half times, sometimes five or more with specific products. Where income varies (bonus, commission, or recently self-employed), lenders read those components differently. The right lender choice can materially change what you can borrow without changing how you earn it.
Deposit size and source
A 10% deposit opens more of the market than a 5% deposit, and a 15% deposit more again. But equally important is where the money has come from. Personal savings need to be evidenced over a few months of statements. Gifted deposits need documentation from the giver. Overseas funds need additional source-of-funds evidence. Getting this right early avoids delays later.
Credit profile
Lenders check credit files closely on first applications. A clean file is straightforward. A file with old defaults, missed payments or active credit applications elsewhere needs to be understood properly — not all marks are equal, and many are workable with the right lender.
The property itself
Affordability is one thing; the property is another. New-build apartments, ex-local-authority flats, properties above commercial premises, short leases and unusual construction all narrow the pool of available lenders. London first-time buyers encounter these factors more often than the national picture suggests.
How deposits work
The deposit is where most first-time buyer questions start, and where misunderstandings often arise. The minimum is technically 5% of the purchase price, but the practical picture is more nuanced.
Personal savings are the simplest case. Lenders typically want to see two to three months of statements showing the funds in place. A Lifetime ISA contribution can be included, and most lenders accept the government bonus alongside it.
Gifted deposits from family are extremely common, particularly in London, and are entirely acceptable to lenders — provided the gift is documented properly. The giver signs a gift letter confirming the money is a gift, not a loan, and is not expected to be repaid. The giver's source of funds may also need to be evidenced. Most lenders will accept gifts from immediate family (parents, grandparents, siblings) without complication; gifts from more distant relatives or friends face more scrutiny.
Deposits from overseas require additional work. Funds held in overseas accounts can usually be used, but the lender's solicitor and the lender themselves will want to see clear documentation of where the money came from, how it was accumulated, and the route it has taken to the UK. This is anti-money-laundering compliance rather than suspicion — but it does need preparing in advance, particularly where bank statements are in another language or another currency. Allow time for this; cases involving overseas deposits often take longer than equivalent UK-only cases.
Documentation you'll need
Different lenders ask for different combinations. The list below covers what we tend to ask for at the start of a conversation so that we can advise properly.
For sole traders and partners: two to three years of SA302s and tax year overviews, the most recent set of accounts if prepared by an accountant, and three months of personal and business bank statements.
For company directors: two to three years of full company accounts, personal SA302s and tax year overviews for the same period, three months of personal and business bank statements, and in some cases an accountant's certificate or reference.
For contractors: current contract, contract history covering the past twelve to twenty-four months, three months of personal and business bank statements, and any payslips or remittance advices.
In all cases: standard identification, proof of address, and recent credit information.
Not everything on this list applies to every case. We'll guide you through what's needed once we understand the circumstances.
How we approach a first purchase
First-time buyer cases benefit from being structured properly from the start. The first conversation is usually about understanding the picture: how much you have saved, where any additional deposit is coming from, what your income looks like, what areas you are considering, what kind of property you have in mind. From there we can outline what is realistically borrowable and against what kind of stock — usually within an hour or two of receiving the information.
If a gifted deposit or overseas funding is in the picture, we identify the documentation needed early. If a JBSP structure makes sense, we explain how it works and discuss it with the supporting family member directly. If credit file factors need attention, we flag them before they become a problem at application.
Once you have a clear borrowing figure and a sense of what the market looks like for that figure, the next step is an Agreement in Principle from the right lender — not necessarily the first one, but the one whose criteria best suit your circumstances. An AIP is often what estate agents ask to see before taking offers seriously, particularly in competitive London markets.
From there, the work is finding the property, agreeing the offer, and converting the AIP into a full mortgage application. We stay involved throughout — coordinating with solicitors, surveyors, estate agents and the lender — so that the case moves through the system as smoothly as possible.
Scenarios we see regularly
First-time buyer applications take many shapes. These are four of the most common patterns we work with.
The salaried solo buyer
Late twenties or early thirties, a few years into a professional career, with savings building steadily and a clear sense of the area they want to be in. The work here is matching the right lender to the income shape and getting an AIP that holds up when offers are made on competitive properties.
The family-supported buyer.
A gifted deposit from parents, sometimes substantial, sometimes alongside a JBSP arrangement to extend affordability. The work here is structuring the support properly — gift letters, source of funds, and whether a JBSP framework is the right vehicle. Done well, family help is straightforward; done casually, it can cause delays at the worst possible moment.
The couple buying together
Two incomes, often with different income structures — perhaps one PAYE and one self-employed, or one with substantial bonus alongside a base salary. Lenders vary considerably in how they combine and assess two incomes, particularly where one of the two has a less conventional shape. The right lender choice can substantially affect joint borrowing capacity.
The buyer with overseas funds.
Often returning UK residents, sometimes UK nationals with savings or family help held abroad, sometimes foreign nationals on UK work visas. Lender choice narrows, documentation expands, and timelines lengthen — but the cases work, provided they are prepared properly from the start.
Common questions
The questions that come up most often in conversations with people buying their first home.
How much deposit do I need as a first-time buyer?
The minimum is 5% of the purchase price, though more lenders and better rates are available at 10% and above. A larger deposit is not always necessary — but where the budget allows, even a small increase (from 5% to 10%, for example) often opens materially better terms.
What is a Joint Borrower Sole Proprietor mortgage?
A JBSP mortgage allows a family member to be added to the mortgage application — their income counts toward affordability — without being on the property title. This means the property is legally owned by the first-time buyer alone, which avoids the second-property stamp duty surcharge that would otherwise apply to the supporting party. It has largely replaced the older "guarantor mortgage" structure.
How long does it take to get a first-time buyer mortgage?
From the first conversation to a mortgage offer, typically four to eight weeks — assuming the documentation is in good order. Cases involving gifted deposits, overseas funds, or complex income can take longer. Cases involving short leases, ex-local-authority properties, or unusual construction can also extend timelines. An Agreement in Principle, by contrast, can often be in place within a day or two.
Can my parents help with the deposit without being on the mortgage?
Yes — a gifted deposit is a common structure and most lenders accept it without issue, provided it is documented properly with a gift letter. The giver is not on the mortgage and has no claim on the property. Separately, a Joint Borrower Sole Proprietor arrangement allows family to be on the mortgage but not on the title deeds, which is useful when their income is needed to increase borrowing.
Can I use overseas savings for my deposit?
Yes, but the documentation requirements are higher than for UK savings. Lenders need clear evidence of source of funds, the originating accounts, and the route the money has taken to the UK. Bank statements in other languages may need certified translations. Allow extra time at the application stage for overseas deposit cases.
Do I need an Agreement in Principle before I make offers?
Strictly, no — but practically, in competitive markets like London, most estate agents will not take an offer seriously without one. An AIP shows that a lender has reviewed your circumstances and is willing to lend, in principle, the amount required. It is not a guarantee, but it is a strong indicator, and it materially improves your standing as a buyer.
Related reading
For first-time buyers wondering what happens once they've made an offer, our piece on What Actually Happens After Your Offer Is Accepted walks through the surveys, searches and timelines that follow. If your purchase involves a chain — which most second-hand London purchases do — Why Buying in a Chain Feels Different explains why these cases move at their own pace, and what helps them move smoothly.
For first-time buyers in specific SW London areas, see our pages on Battersea, Clapham, Wandsworth and Fulham.
Ready to talk it through?
If you're starting to think about a first purchase, we'd be glad to help you understand what's possible. The first conversation is informal and obligation-free — a chance to walk through your circumstances, identify any factors worth preparing for, and outline a realistic borrowing picture before you start making offers.